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<title>Using the GNU Compiler Collection (GCC): MicroBlaze Options</title>

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<a name="MicroBlaze-Options"></a>
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<p>
Next: <a href="MIPS-Options.html#MIPS-Options" accesskey="n" rel="next">MIPS Options</a>, Previous: <a href="MeP-Options.html#MeP-Options" accesskey="p" rel="prev">MeP Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="MicroBlaze-Options-1"></a>
<h4 class="subsection">3.18.25 MicroBlaze Options</h4>
<a name="index-MicroBlaze-Options"></a>

<dl compact="compact">
<dt><code>-msoft-float</code></dt>
<dd><a name="index-msoft_002dfloat-5"></a>
<p>Use software emulation for floating point (default).
</p>
</dd>
<dt><code>-mhard-float</code></dt>
<dd><a name="index-mhard_002dfloat-2"></a>
<p>Use hardware floating-point instructions.
</p>
</dd>
<dt><code>-mmemcpy</code></dt>
<dd><a name="index-mmemcpy"></a>
<p>Do not optimize block moves, use <code>memcpy</code>.
</p>
</dd>
<dt><code>-mno-clearbss</code></dt>
<dd><a name="index-mno_002dclearbss"></a>
<p>This option is deprecated.  Use <samp>-fno-zero-initialized-in-bss</samp> instead.
</p>
</dd>
<dt><code>-mcpu=<var>cpu-type</var></code></dt>
<dd><a name="index-mcpu_003d-2"></a>
<p>Use features of, and schedule code for, the given CPU.
Supported values are in the format &lsquo;<samp>v<var>X</var>.<var>YY</var>.<var>Z</var></samp>&rsquo;,
where <var>X</var> is a major version, <var>YY</var> is the minor version, and
<var>Z</var> is compatibility code.  Example values are &lsquo;<samp>v3.00.a</samp>&rsquo;,
&lsquo;<samp>v4.00.b</samp>&rsquo;, &lsquo;<samp>v5.00.a</samp>&rsquo;, &lsquo;<samp>v5.00.b</samp>&rsquo;, &lsquo;<samp>v5.00.b</samp>&rsquo;, &lsquo;<samp>v6.00.a</samp>&rsquo;.
</p>
</dd>
<dt><code>-mxl-soft-mul</code></dt>
<dd><a name="index-mxl_002dsoft_002dmul"></a>
<p>Use software multiply emulation (default).
</p>
</dd>
<dt><code>-mxl-soft-div</code></dt>
<dd><a name="index-mxl_002dsoft_002ddiv"></a>
<p>Use software emulation for divides (default).
</p>
</dd>
<dt><code>-mxl-barrel-shift</code></dt>
<dd><a name="index-mxl_002dbarrel_002dshift"></a>
<p>Use the hardware barrel shifter.
</p>
</dd>
<dt><code>-mxl-pattern-compare</code></dt>
<dd><a name="index-mxl_002dpattern_002dcompare"></a>
<p>Use pattern compare instructions.
</p>
</dd>
<dt><code>-msmall-divides</code></dt>
<dd><a name="index-msmall_002ddivides"></a>
<p>Use table lookup optimization for small signed integer divisions.
</p>
</dd>
<dt><code>-mxl-stack-check</code></dt>
<dd><a name="index-mxl_002dstack_002dcheck"></a>
<p>This option is deprecated.  Use <samp>-fstack-check</samp> instead.
</p>
</dd>
<dt><code>-mxl-gp-opt</code></dt>
<dd><a name="index-mxl_002dgp_002dopt"></a>
<p>Use GP-relative <code>.sdata</code>/<code>.sbss</code> sections.
</p>
</dd>
<dt><code>-mxl-multiply-high</code></dt>
<dd><a name="index-mxl_002dmultiply_002dhigh"></a>
<p>Use multiply high instructions for high part of 32x32 multiply.
</p>
</dd>
<dt><code>-mxl-float-convert</code></dt>
<dd><a name="index-mxl_002dfloat_002dconvert"></a>
<p>Use hardware floating-point conversion instructions.
</p>
</dd>
<dt><code>-mxl-float-sqrt</code></dt>
<dd><a name="index-mxl_002dfloat_002dsqrt"></a>
<p>Use hardware floating-point square root instruction.
</p>
</dd>
<dt><code>-mbig-endian</code></dt>
<dd><a name="index-mbig_002dendian-6"></a>
<p>Generate code for a big-endian target.
</p>
</dd>
<dt><code>-mlittle-endian</code></dt>
<dd><a name="index-mlittle_002dendian-6"></a>
<p>Generate code for a little-endian target.
</p>
</dd>
<dt><code>-mxl-reorder</code></dt>
<dd><a name="index-mxl_002dreorder"></a>
<p>Use reorder instructions (swap and byte reversed load/store).
</p>
</dd>
<dt><code>-mxl-mode-<var>app-model</var></code></dt>
<dd><p>Select application model <var>app-model</var>.  Valid models are
</p><dl compact="compact">
<dt>&lsquo;<samp>executable</samp>&rsquo;</dt>
<dd><p>normal executable (default), uses startup code <samp>crt0.o</samp>.
</p>
</dd>
<dt>&lsquo;<samp>xmdstub</samp>&rsquo;</dt>
<dd><p>for use with Xilinx Microprocessor Debugger (XMD) based
software intrusive debug agent called xmdstub. This uses startup file
<samp>crt1.o</samp> and sets the start address of the program to 0x800.
</p>
</dd>
<dt>&lsquo;<samp>bootstrap</samp>&rsquo;</dt>
<dd><p>for applications that are loaded using a bootloader.
This model uses startup file <samp>crt2.o</samp> which does not contain a processor
reset vector handler. This is suitable for transferring control on a
processor reset to the bootloader rather than the application.
</p>
</dd>
<dt>&lsquo;<samp>novectors</samp>&rsquo;</dt>
<dd><p>for applications that do not require any of the
MicroBlaze vectors. This option may be useful for applications running
within a monitoring application. This model uses <samp>crt3.o</samp> as a startup file.
</p></dd>
</dl>

<p>Option <samp>-xl-mode-<var>app-model</var></samp> is a deprecated alias for
<samp>-mxl-mode-<var>app-model</var></samp>.
</p>
</dd>
</dl>

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